JPH0650836Y2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a recording apparatus for recording a signal on a tape wound around a drum, and particularly to a serve technology at the start of recording.

[Outline of device]

The present invention relates to a recording apparatus in which a tape wound around a drum is driven by a rotational force of a capstan, and when a recording mode is selected, the capstan is activated after a speed servo and a phase servo of the drum are applied. By configuring to start recording, the disturbance of the recording signal at the start of recording is completely eliminated.

[Conventional technology]

Various recording devices (for example, 8 mm camera) for recording video signals and the like on a tape have been developed. In such a recording device, a head is fixed to a drum and the drum is rotated by a drum motor. A tape is wound around the drum at a certain angle, and the tape is interposed between the pinch roller and the capstan in a pressure contact state at a point spaced apart from the drum by a certain distance.

Then, as shown in FIG. 3, when the recording mode is selected, the drum is first activated and the head scans the tape. When the speed servo of the drum is applied, the capstan is activated and the tape runs. Then, the head is configured to start recording on the tape after a lapse of a certain time from the activation of the capstan, that is, after the speed and phase servo of the capstan are applied.

[Problems to be Solved by the Invention]

However, it is normal until the speed servo of the drum is applied.
Although it is 0.3 to 0.4 seconds, the time until the phase servo of the drum is applied may be 0.3 seconds or 3 seconds. The wait time after starting the capstan varies depending on the model, but is between 0.9 and 1.5 seconds. Therefore, in some cases, recording may be started before the servo of the drum phase is applied, and the recording signal may be disturbed at the start of recording.

Here, in order to eliminate this drawback, it may be possible to set a long wait time after the capstan is activated. However, as a method of starting recording immediately after selecting the recording mode, there is a method of selecting the recording mode after selecting the recording pause mode, but this method is meaningless. That is, when the recording pause mode is selected, the drum is activated and stands by. Then the recording mode is selected (3rd
(Point A in the figure), the capstan is activated, and recording is started after waiting for a certain period of time. Therefore, if the wait time is set to be long, the time from the recording mode selection to the recording start does not change much even if the recording mode is selected from the beginning and recording is performed via the recording pause mode. I can't.

Therefore, an object of the present invention is to provide a recording apparatus which can completely eliminate the disturbance of the recording signal at the start of recording without adopting the above means.

[Means for Solving the Problems]

To achieve the above object, the recording apparatus of the present invention comprises a drum around which a tape is wound at a certain angle, a drum motor control circuit for controlling the drive of a drum motor of the drum, a rotational speed of the drum, and A speed servo circuit that outputs a speed servo lock signal when a servo is applied, a phase servo circuit that detects the phase of the drum and outputs a phase servo lock signal when a phase servo is applied, and a capstan that gives a running force to the tape. And a capstan control circuit that controls the drive of the capstan motor of this capstan, and when the recording mode is selected, a motor start signal is output to the drum motor control circuit, and the speed servo lock signal of the speed servo circuit is output. And the phase servo lock signal of the phase servo circuit are output together, the capstan control circuit It is obtained by a system controller for outputting over data start signal.

[Action]

When the recording mode is selected, the drum is activated, and after the drum speed servo and phase derbo are applied, the capstan is activated, the tape runs on the drum, and the head scans the tape. Then, after the capstan is activated, the head starts recording, for example, after a certain time has elapsed. Therefore, the recording signal is not disturbed because the time when the head starts recording is not only the speed servo of the drum but also the phase servo.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

An embodiment in which the present invention is applied to an 8 mm camera as a recording device is shown in FIGS. 1 and 2.

In FIG. 1, four heads 2 are fixed to the outer periphery of a drum 1 at predetermined intervals, and these four heads 2 are arranged so that they face each other and have the same channel. Therefore, two frames of video signals and the like are recorded per one rotation of the drum. A pinch roller 3 and a capstan 4 are provided adjacent to each other at a point spaced apart from the drum 1 by a predetermined distance. The tape 5 is wound around the drum 1 at an angle of about 270 degrees in the traveling direction, and is arranged between the pinch roller 3 and the capstan 4 for traveling. The pinch roller 3 and the capstan 4 are pressed against each other via the tape 5 in the recording mode,
Is driven by the rotational force of the capstan 4.

The drum 1 is rotationally driven by a drum motor 6, and the drum motor 6 is controlled by a drive control signal of a drum motor control circuit 7. The rotation cycle of the drum motor 6 is detected by the frequency generator (FG) 8 and the pulse generator (PG) 9, and the output of the frequency generator 8 is sent to the speed servo circuit 10.
The output of the pulse generator 9 is guided to the phase servo circuit 11, respectively. The speed servo circuit 10 obtains a speed error signal by a trapezoidal wave shaped from the output of the frequency generator 8 and a gate pulse generated from the output of the frequency generator 8, and outputs this speed error signal to the drum motor control circuit 7. . or,
The speed servo circuit 10 outputs a speed servo lock signal to the system control 12 when the speed error disappears, that is, when the speed servo is applied. The phase servo circuit
The vertical drive pulse (VD) is input from the camera system in addition to the output of the pulse generator 9, and 11 performs phase comparison between the output of the pulse generator 9 and the vertical drive pulse (VD) to obtain a phase error signal. obtain. When the phase error signal is output to the drum motor control circuit 7 and the phase error disappears,
That is, when the phase servo is applied, the phase servo lock signal is output to the system control 12. The drum motor control circuit 7 controls the rotation of the drum motor 6 based on the speed error signal and the phase error signal, and starts / stops the drum motor 6 by the motor start signal / motor stop signal from the system control 12.

The capstan 4 is rotationally driven by a capstan motor 13, and the capstan motor 13 is controlled by a drive control signal of a capstan motor control circuit 14. Further, the rotation cycle of the capstan motor 13 is detected by the frequency generator (FG) 15, and the output of this frequency generator 15 is guided to the speed servo circuit 16. The speed servo circuit 16 obtains a speed error signal by the same means as the above speed servo circuit 10, for example, and the speed error signal is supplied to the capstan motor control circuit 14
Output to. Also, automatic tracking control circuit (ATF) 17
Is a phase error signal by extracting a pilot signal from the signals output from the four heads 2 and comparing the pilot signal with the reference signals (f ₁ , f ₂ , f ₃ , f ₄ ) from the reference oscillator. And outputs this phase error signal to the capstan motor control circuit 14. The capstan motor control circuit 14 controls the rotation of the capstan motor 13 based on the speed error signal and the phase error signal, and at the same time, the system control 12
The capstan motor 13 is started / stopped by the motor start signal / motor stop signal from the.

The system control 12 has a REC switch (SW ₁ ) and R
When the recording mode, the recording pause mode, etc. are selected by the EC / PAUS switch (SW ₂ ), etc., the drum motor control circuit 7, the capstan motor control circuit 14, etc. are controlled in accordance with each mode. The flowchart as shown in FIG. 2 is executed. In Fig. 2, the fixed time of the "fixed time wait" step is set to a time sufficient for the speed servo and phase servo of the capstan 4 to be applied. This time varies depending on the model but is in the range of 0.9 to 1.5 seconds. Is.

The operation of the above configuration will be described below.

In Fig. 1 and Fig. 2, the photographer catches the subject
When the REC switch (SW ₁ ) is turned on, the system control 12 detects that the recording mode has been selected. Then, the system control 12 first outputs a motor start signal to the drum motor control circuit 7, and the drum motor 6 is driven by the drive control signal of the drum motor control circuit 7. When the drum motor 6 is driven, the drum 1 is activated together with the head 2, and the outputs of the frequency generator 8 and the pulse generator 9 are sent to the speed servo circuit 10 and the phase turbo circuit 11, respectively. The speed servo circuit 10 and the phase servo circuit 11 send a speed error signal and a phase error signal to the drum motor control circuit 7 according to the outputs of the frequency generator 8 and the pulse generator 9, respectively, to control the speed and phase. . Then, when the speed servo is applied, the speed servo circuit 10 outputs a speed servo lock signal to the system control 12, and when the phase servo is applied, the phase servo circuit 11 outputs a phase servo lock signal to the system control 12, respectively. When both the speed servo lock signal and the phase servo lock signal are input, the system control 12 outputs a motor start signal to the capstan motor control circuit 14 for the first time. Then, the capstan motor control circuit 14 outputs a drive control signal to the capstan motor 13, and the capstan motor 13 is driven. When the capstan motor 13 is driven, the capstan 4 starts to rotate, the tape 5 runs, and the speed servo circuit 16 and the automatic tracking control circuit 17 operate to apply speed servo and phase servo to the capstan motor 13. The system control 12 controls the capstan motor control circuit 14 to output a motor start signal to send a video signal to the head 2 after a fixed time.
Recording on the tape 5 is started. When the recording on the tape 5 is started, the recording signal is recorded without being disturbed because the velocity servo and the phase servo of the drum 1 are applied.

[Effect of device]

As described above, according to the present invention, when the recording mode is selected, the capstan is activated to start recording after the drum speed servo and phase servo are applied. This has the effect of completely eliminating the signal disturbance.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a circuit block diagram, FIG. 2 is a flow chart at the start of recording, and FIG. 3 is a flow chart at the start of conventional recording. is there. 1 ... Drum, 4 ... Capstan, 5 ... Tape.

Claims (1)

[Scope of utility model registration request] 1. A drum around which a tape is wound at a constant angle, a drum motor control circuit for controlling the drive of a drum motor of the drum, a rotational speed of the drum is detected, and a speed servo lock signal is sent when a speed servo is applied. A speed servo circuit for outputting, a phase servo circuit for detecting the phase of the drum and outputting a phase servo lock signal when a phase servo is applied, a capstan for giving a running force to the tape, and a capstan motor for the capstan. When the recording mode is selected, the motor start signal is output to the drum motor control circuit, and the speed servo lock signal of the speed servo circuit and the phase servo lock of the phase servo circuit are controlled. A system for outputting a motor start signal to the capstan control circuit when both the signal and the signal are output. Recording apparatus characterized by comprising a controller.